Objective-C, Cocoa Touch, UIKit, CoreData, AVFoundation, Accounts, AddressBook, CoreFoundation, CoreImage, CoreLocation, CoreMedia, EventKit, iAd, MapKit, MediaPlayer, QuartzCore
Appcelerator Titanium for both iOS and Android , PhoneGap
Java J2EE , Hibernate, Spring, XML, Design Patterns, Liferay, WebServices, REST, Grails, Groovy, Tomcat, Websphere
HTML, javascript, CSS, Grails, NodeJS, Rails, JSON